Roman steps

I believe I know where that is as you are leaving Puenta de la Reina

Just for info - I tried to ride my bike down that section of the trail - after leaving Cirauqui - luckily there was a diversion around those steps (on the Eastern side) to the bridge, but no diversion up the western side. It was bloody difficult - I had to carry it up those steps!!!
Just in case you ask WHY? - well none of the 3 guide books I had mention the steps down or up - so foolish me thought I could ride or walk the bike down it. After I reached the top I took a 15 min rest and then to the highway to the next town.
Great photo!!

@Saint Mike II this year I did it was very lonely walk the incline was hard, then a Guardia Civil jeep came around and encouraged me to continue.